Associated Press
FILE - In this Thursday, Oct. 11, 2007, file photo, private equity investor Carl Icahn speaks at the World Business Forum in New York. Billionaire investor Carl Icahn said Tuesday, Dec. 4, 2012, he is giving up his bid to buy truck maker Oshkosh after less than 25 percent of the company's shares were tendered before his offer expired. Last week Icahn made it clear that he would walk away from his bid that valued the company at about $3 billion if the threshold wasn't met. The tender offer expired on Monday, with about 22 percent of the shares tendered.  (AP Photo/Mark Lennihan)

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